//
//  tabBar.swift
//  微博三天
//
//  Created by jessica on 15/11/13.
//  Copyright © 2015年 jessica. All rights reserved.
//

import UIKit

//添加按钮部分

class MaintabBar: UITabBar {

    //默认构造方法
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setupUI()
    }

    required init?(coder aDecoder: NSCoder) {
//        fatalError("init(coder:) has not been implemented")
        super.init(coder: aDecoder)
        
        setupUI()
    }
    
    //撰写按钮
    private func setupUI(){
    
    addSubview(composeBtn)
    
    }
    
    //布局layoutSubviews
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        
let w = self.bounds.width / 5
        let h = self.bounds.height
        let rect = CGRectMake(0, 0, w, h)
        
        var index : CGFloat = 0
        for subView in subviews {
       
            if subView.isKindOfClass(NSClassFromString("UITabBarButton")!)
            {
             subView.frame = CGRectOffset(rect, w * index, 0)
            
                if index == 1{
                
                index++
                
                }
                index++
            
            }
        }
        
        //记得在MainViewController里面KVC才会有,因为要修改必须这样
        composeBtn.frame = CGRectOffset(rect, 2 * w, 0)
        bringSubviewToFront(composeBtn)
        
    }
    

    
    
    //懒加载控件(按钮) //这里不能private 否则不能点击事件了
  lazy var composeBtn : UIButton = {
    
        
        let btn = UIButton()
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
    btn.sizeToFit()
     return btn
    }()
    

}
